Grammy-winning DJ Skrillex, who will join Jay-Z and Pearl Jam at the Made in America festival in Philadelphia in September, played to a wild Quincy crowd during the opening-weekend celebration at the Ocean Club at Marina Bay on Friday night. Skrillex made time during his visit to walk around the Back Bay, where he took some Instagram shots of brownstone buildings and street dancers. For more on the performance, see the G section, Page 5.